Expanding universe with positive bulk viscous pressures?

Details Expanding universe with positive bulk viscous pressures? Expanding universe with positive bulk viscous pressures?

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrvd..61j8301z&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 61, Issue 10, 15 May 2000, id.108301

Mathematics

Logic

21

Particle-Theory And Field-Theory Models Of The Early Universe, Wave Propagation And Interactions, Background Radiations

Scientific paper

In a recent paper [M. Giovannini, Phys. Rev. D 59, 121301 (1999)] an approach was proposed according to which sufficiently large bulk viscous stresses which imply a violation of the dominant energy condition cause a modification of energy spectra of relic gravitons which in principle might be observable. We point out that this approach is unphysical since it is incompatible with the second law of thermodynamics at late cosmological times.

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